Despatch Protocol 3 Controller - Manual (Page 9)

Protocol 3 Controller Owner’s Manual A BOUT T HIS M ANUAL
Version 1.2 9
Copyright © 2013 by Despatch Industries.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
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1.5. Specifications
Specifications for the Protocol 3 controller include six sets of information:

Process Input (Table 1)

Outputs (Table 2)

Operating Conditions (Table 3)

Conformance Norms (Table 4)

Display (Table 5)

Data Recorder (Table 6)
Table 1. Process Input.
Item
Description
Sampling Rate: 4 per second
Resolution: 16 bits. Always four times better than display resolution.
Impedance: >10MΩresistive, except DC mA (5Ω) and V (47kΩ)
Temp Stability: Error <0.01% of span per °C change in ambient temperature
Supply Variation: Supply voltage influence negligible within supply limits
Humidity Influence: Negligible if non
‐condensing
Process Display: Displays up to 5% over and 5% under span limits
Process Variable
Input Offset: Reading adjustable ± Controller Span. Values added to
Process Variable, Values subtracted from Process Variable.
Sensor Break
Detection: 
Thermocouple & RTD —SSR output goes to 0

High Limit Sensor Break alarms activate

Linear (4 to 20mA, 2 to 10V and 1 to 5V only) —SSR
output goes to 0
Isolation: Isolated from all outputs (except SSR driver) at 240V AC
Supported
Thermocouple Types
& Ranges:
Type Range °C Range °F
B +100 to 1824°C +211 to 3315°F
C 0 to 2320°C 32 to 4208°F
D 0 to 2315°C 32 to 4199°F
E -240 to 1000°C
‐400 to 1832°F
J -200 to 1200°C -328 to 2192°F *
K ‐200 to 1200°C ‐328 to 2192°F *
L 0 to 762°C 32 to 1402°F *
N 0 to 1399°C 32 to 2551°F *
PtRh
20%: 40%
0 to 1850°C 32 to 3362°F
R 0 to 1759°C 32 to 3198°F